Disk drive unit for a computer system



FIG. 1 is a front perspective view of the disk drive unit for a computer system showing the new design;

FIGS. 2 and 3 are respective enlarged front and side elevational views thereof, one of the drives being omitted for convenience of illustration;

FIG. 4 is an enlarged top plan view thereof;

FIG. 5 is an enlarged bottom plan view thereof; and

FIG. 6 is a rear perspective view thereof. 

The ornamental design for a disk drive unit for a computer system, as shown and described. 